Stereo Head-Pose Reprojection

Stereo Head Pose

Motion-to-photon latency 40 ms

Head turn speed 70°/s

Interpupillary distance 63 mm

Pose error

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Rendered eyes

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IPD (world units)

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Frame

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How it works

A real HMD renders two views of the same scene, one per eye, offset horizontally by the wearer's interpupillary distance (IPD) — that binocular disparity is what the brain reads as depth. Both eye cameras are oriented using a head pose sampled latency milliseconds ago, not the pose right now, so the whole stereo pair can be looking slightly the wrong way the instant it reaches the display.

eyePos = headPos ± (IPD/2)·right(headYaw)
renderYaw = headYaw(t − latency)
poseError = |headYaw(t) − renderYaw|

Motion-to-photon latency — delay between the true head pose and the pose the current stereo pair was rendered from.
Head turn speed — how fast the simulated head yaws left-right; faster turns turn a fixed latency into a larger pose error.
Interpupillary distance — physical eye separation; it sets how far apart the two cameras sit and how strong the stereo depth cue is.
Timewarp — rotates the already-rendered stereo pair toward the latest head pose right before scan-out, without touching eye separation or re-rendering the room.

The wireframe frustum floating in the scene marks the true head orientation right now; the two lit viewports on either side of the divider show what each eye is actually being shown, rendered from the delayed pose.

True head frustum (wireframe) Left / right eye render

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Stereo Head-Pose Reprojection Simulator